CN109541175A - A kind of simulation down-hole drilling fluids recycle the device and method to form mud cake - Google Patents
A kind of simulation down-hole drilling fluids recycle the device and method to form mud cake Download PDFInfo
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- CN109541175A CN109541175A CN201811381935.3A CN201811381935A CN109541175A CN 109541175 A CN109541175 A CN 109541175A CN 201811381935 A CN201811381935 A CN 201811381935A CN 109541175 A CN109541175 A CN 109541175A
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Abstract
This application provides a kind of simulation down-hole drilling fluids to recycle the device and method to form mud cake, it is related to oil gas well cementing operation field technical field, the device and method overcome the problem of drilling fluid in previous device only stirs in a closed cavity rather than flows recurrent state under real well, the pressure in practical pit shaft with stratum can be gone out with real simulation simultaneously, simulate well temperature, the forming process of mud cake under pressure condition, really degree is maximized to simulate the formation of mud cake and simulate the flushing process of mud cake, reliability is had more to the evaluation of the flush efficiency of flushing liquor, the condition of the mud cake of formation is more consistent with actual conditions, simulation degree is high.Influence for the subsequent research to mud cake performance and analysis mud cake to bonding quality provides basis, provides reference for live preferably mud cake flushing liquor.
Description
Technical field
The present invention relates to oil gas well cementing operation fields, belong to reservoir rock Physical Experiment technology, and in particular to a kind of simulation well
The device and method that lower circulation of drilling fluid forms mud cake.
Background technique
Mud cake is drilling fluid leak-off formation in the earth formation, be influence well cementation one of second contact surface bonding quality it is important because
Element, high degree affects the quality of cementing quality, thus should fully consider mud cake in existing primary cement evaluation experiment
Influence.
The device research of the bonding quality of Lab-evaluation well cementation at present is numerous, but the research for forming device to mud cake is more single
One, it is broadly divided into static filtration and two kinds of dynamic filtration.Static filtration is that drilling fluid is lost on ground in the state of static
Layer surface forms mud cake, but in actual condition, it is new bore drilling fluid when opening stratum be all circulating, therefore static filtration with
Fact is not consistent, and the performance (such as intensity, permeability) for forming mud cake has differences with actual conditions.Dynamic filtration is then to simulate
Mud cake is formed in surface of stratum leak-off under the premise of circulation of drilling fluid flowing, is more consistent with actual conditions.Dynamic filtration mud cake
Forming device, presently, there are more researchs, but there are still many deficiencies.
But present inventor has found that above-mentioned technology at least has following technology during realizing the embodiment of the present application
Problem:
(1) it around rock core rotational flow is not circulate, and rock core blocks filter that drilling fluid, which is in confined space,
Liquid outlet, since percolation path length leads to the different mud cakes for easily forming uneven thickness in core surface of filtrational resistance, and very
Hardly possible forms certain thickness mud cake；
(2) at present in laboratory it is existing it is static, there are still biggish difference, nothings with practical underground working for dynamic filtration instrument
Method simulates the leak-off situation of drilling fluid under downhole temperature, pressure, flow velocity completely.
Therefore, existing research there are aiming at the problem that, propose a set of completely can truly simulate downhole temperature, pressure
And the mud cake of drilling fluid flow regime forms the hot spot that device and method are those skilled in the art's research.
Summary of the invention
In order to overcome the shortcomings of that existing technology completely can not really simulate underground working, the embodiment of the present application is provided
A kind of simulation down-hole drilling fluids recycle the device and method to form mud cake, which overcomes drilling fluid in previous device
The problem of only being stirred in a closed cavity rather than flowing recurrent state under real well, while can be gone out with real simulation practical
It simulates the formation of mud cake with the pressure on stratum, maximization really degree in pit shaft and simulates the flushing process of mud cake, liquidate
The evaluation of the flush efficiency of washing lotion has more reliability, and the condition of the mud cake of formation is more consistent with actual conditions, and simulation degree is high.
The embodiment of the present application solves technical solution used by its technical problem:
A kind of simulation down-hole drilling fluids recycle the device to form mud cake, including autoclave body and fluid circulation matched with autoclave body system
System simulates down-hole drilling fluids and recycles to form mud cake by the cooperation of autoclave body and fluid circulating system.
The autoclave body bottom is provided with rock core grip slipper and the outlet of autoclave body annular space, and rock core grip slipper plays fixed rock core
The liquid inside autoclave body can be discharged in effect, the outlet of autoclave body annular space；Autoclave body top side detachable is provided with kettle cover, convenient dismounting in time
Upper kettle cover；Be clamped with rock core on rock core grip slipper, rock core bottom is provided with permeable gasket, permeable gasket mainly bear rock core and
The bulky grain in filtrate can be avoided to enter fluid circulating system and blocked with filter liquor；Exist between inner wall of kettle and rock core
Annular clearance, in order to maximize simulation subsurface environment, which should be consistent with annular clearance under real well as far as possible, can root
According to requiring to design.Upper kettle cover central location is provided with fluid-infusing port, injects fluid by fluid-infusing port；On rock core grip slipper
Lower both ends are respectively arranged with upper plug head and lower end cap, and upper plug head is annular plug, are threadedly coupled with rock core grip slipper, sealing ring is close
Envelope；Lower end cap is a round plug, is threadedly coupled with rock core grip slipper, sealing ring sealing, is provided with filtrate (liquid on lower end cap,
Facilitate discharge filtrate by filtrate (liquid；Upper and lower plug covers rubber sleeve, compresses simultaneously fixed rubber sleeve, rubber sleeve outer surface with
Rock core clamps base inner surface and forms ring pressure chamber, and into ring pressure chamber, injection pressure fluid makes rubber sleeve compress rock core, to fix rock core.
The fluid circulating system includes drilling well liquid container, filtrate container and ring press pump, is equipped with and bores in drilling well liquid container
Well liquid, filtrate container is to collect filtrate；The inlet of drilling well liquid container connects the outlet of autoclave body annular space by drilling fluid inlet tube,
To facilitate recycling drilling fluid, the liquid outlet of drilling well liquid container is by drilling fluid outlet tube connecting fluid inlet, thus from stream
Drilling fluid is injected in body inlet, operating path when this route is circulation of drilling fluid；The inlet of filtrate container passes through filtrate
Inlet tube connects filtrate (liquid, facilitates and collects filtrate；The outlet of ring press pump presses chamber fluid line to be connected to ring and presses chamber by ring, can
The injection pressure fluid into ring pressure chamber, makes rubber sleeve be fixed rock core；Along fluid flow direction, drilling fluid inlet tube successively
It has been arranged in series third control valve and the second back-pressure valve, has been sequentially connected in series on drilling fluid outlet tube and is provided with displacement pump and the 5th control
Valve is sequentially connected in series on filtrate inlet tube and is provided with the second control valve, the 4th back-pressure valve and flowmeter, ring press on chamber fluid line according to
It is secondary to be arranged in series the first control valve and pressure gauge；The 4th control valve has also been arranged in parallel on drilling fluid inlet tube.
First back-pressure valve be in order to filtrate (liquid end formed back pressure, simulated formation pore pressure, described second time
Pressure valve is to form pressure, simulation wellbore hole pressure in autoclave body annular space；There is pressure between first back-pressure valve and the second back-pressure valve
(general wellbore pressure is higher than formation pore pressure, the i.e. pressure of a little higher than first back-pressure valve of the pressure value of the second back-pressure valve to difference
Value), make there are pressure difference inside and outside rock core, drilling fluid occurs leak-off under the action of pressure difference, forms mud cake on rock core.
Preferably, the upper kettle cover is threadedly coupled with autoclave body, easy disassembly；Fluid-infusing port on upper kettle cover on to
It is lower in the horn-like structure being gradually increased, avoid fluid mouthpiece in injection is too small from causing flow velocity excessive to wash away sternly core surface
Weight.
Preferably, the autoclave body is internally provided with temperature sensor and flow sensor, to monitor fluid in autoclave body
Temperature and flow velocity, achieve the purpose that simulate downhole temperature and drilling well flow velocity.
Preferably, the permeable gasket bottom is provided with false rock core, and false rock core can adjust rock core position.
Preferably, the autoclave body and fluid circulating system are mounted on inside insulating box, insulating box simulated formation temperature.
Preferably, the displacement pump, temperature sensor, flow sensor, the first backpressure pump, the second backpressure pump, flow
Meter and insulating box are electrically connected computer, control relevant operation modes by computer, and record data.
Preferably, the rock core grip slipper is set to autoclave body bottom central location.
A method of simulation down-hole drilling fluids recycle to form mud cake, the method the following steps are included:
(1) rock core prepares: rock core size can be diversified, and the mud cake that can correspondingly design different scale forms device,
It drilling in one end of rock core along central axis, drilling does not run through rock core,
(2) rock core is installed: laying down kettle cover, rock core is placed in the rubber sleeve of rock core grip slipper, and the aperture of rock core
It is directed downward, opens the first control valve, open ring press pump, constant pressure is injected into the ring pressure chamber that rubber sleeve is formed with rock core grip slipper
Fluid, pressure value are higher by 2~3MPa than the first back-pressure valve of setting and the pressure value of the second back-pressure valve, make rubber sleeve in ring pressure
Effect is lower to be compressed and fixes rock core, while preventing that channelling occurs when pressure is higher than ring pressure in autoclave body.
(3) mud cake is formed: after installation rock core, upper kettle cover being screwed back and is sealed, opens the temperature of insulating box to requirement of experiment
Degree, adjusting the pressure value of the first back-pressure valve and the second back-pressure valve, (the second back-pressure valve is drilling fluid liquid to the pressure value of requirement of experiment
Column pressure value, the first back-pressure valve are formation pore pressure value, and general drilling well liquid columnpressure is slightly above formation pore pressure, i.e., the
The pressure value of two back-pressure valves setting is slightly above the first back-pressure valve pressure value).Displacement pump is opened, the flow Q of displacement pump is adjusted, makes to bore
Flow velocity v of the well liquid in autoclave body reaches the flow velocity of down-hole annular drilling fluid: by the operating pressure and stream of computer record displacement pump
Amount.Known autoclave body internal diameter is D2, the diameter D of rock core1, then it is A=π (D known to annular space area2 2-D1 2)/4, therefore can substantially estimate ring
Empty drilling well flow velocity v=4Q/ (π (D2 2-D1 2)), further according to the flow Q for the flow velocity fine tuning pump that flow sensor is shown, make ring
Empty flow velocity is as far as possible close to the flow velocity of setting.Drilling fluid is sucked out by displacement pump constant flow rate from container, flows through displacement pump and enters kettle
In body, when the pressure in autoclave body annular space reaches the pressure size of the second back-pressure valve, export from autoclave body annular space through the second back-pressure valve
Drilling well liquid container is flowed back to, since the first back-pressure valve is smaller than the pressure value of the second back-pressure valve, therefore there are pressure difference inside and outside rock core,
Under differential pressure action leak-off occurs for drilling fluid, core surface formed mud cake, and filtrate from filtrate (liquid through the first back-pressure valve, stream
Meter flow to filtrate container.
(4) mud cake rinses: after mud cake is formed, stopping displacement pump, the drilling fluid in drilling well liquid container is replaced with flushing
Liquid, reopens displacement pump, and the flow of adjustment displacement pump makes the flow velocity of flushing liquor simulate the flow velocity of underground flushing liquor, and make
Flushing liquor circulation flushing mud cake for a period of time, closes displacement pump later.
(5) it removal of core: after closing displacement pump, opens the 4th control valve and discharges the residual fluid in autoclave body completely；It closes
Closed loop press pump exits the pressure fluid in rubber sleeve；Kettle cover in opening takes out the rock core with mud cake.
Preferably, in step (1), the diameter of drilling is the 1/5~1/10 of core diameter, foot of hole to the another of rock core
The distance of end face is equal to the distance that rock core radius subtracts boring radius, that is, guarantees the road in external drilling fluid seepage flow to core hole
Electrical path length is consistent.
Preferably, in step (3), the second back-pressure valve pressure value is greater than the first back-pressure valve pressure value, when the pressure in autoclave body
When reaching the first back-pressure valve or the second back-pressure valve pressure, drilling fluid is flowed out from corresponding back-pressure valve.
Preferably, in step (4), the flush efficiency of flushing liquor can also be evaluated, specific implementation method are as follows:
In the method and step of above-mentioned formation mud cake, in installation rock core and after screwing back upper kettle cover, close autoclave body it is all go out
The valve (i.e. the second control valve, third control valve) of mouth injects drilling fluid pressurization saturated core into autoclave body, completely full to rock core
After drilling fluid, the 4th control valve discharging drilling fluid is opened, its weight of removal of core is referred to as m1；Rock core is installed again, is pressed
Circulation of drilling fluid is carried out according to mud cake forming step, forms mud cake, its weight of removal of core is referred to as m2；Rock core is installed again,
It is rinsed liquid according to mud cake rinsing step to rinse, after the completion of flushing, its weight of removal of core is referred to as m3；Then flush efficiency can be counted
It calculates are as follows:
Compared with prior art, the invention has the following advantages that
(1) process that really can completely simulate down-hole drilling fluids flow circuit, overcomes drilling fluid in previous device
The problem of only stirring in a closed cavity rather than flowing recurrent state under real well, the present invention can truly simulate well
The mud cake of lower drilling fluid nowed forming and flow velocity, formation is more consistent with actual conditions.
(2) there are pressure difference, fluids for be formed as downhole well fluid pressure and the formation pore pressure of mud cake under real well
Leak-off forms mud cake in the borehole wall.And the present apparatus can real simulation go out in practical pit shaft and the pressure on stratum, therefore the mud cake of formation
Condition is more consistent with actual conditions, and simulation degree is high.
(3) formation that really degree simulates mud cake is maximized, and maximizing simulates the flushing process of mud cake, it is right
The evaluation of the flush efficiency of flushing liquor has more reliability.
Detailed description of the invention
Fig. 1 is that simulation down-hole drilling fluids recycle the apparatus structure schematic diagram to form mud cake.
Specific embodiment
The embodiment of the present application recycles the device and method to form mud cake by providing a kind of simulation down-hole drilling fluids, solves
The problem of drilling fluid only stirs in a closed cavity rather than flows recurrent state under real well in the prior art, while can
Gone out in practical pit shaft with real simulation and the pressure on stratum, maximization really degree simulate the formation of mud cake and simulate mud cake
Flushing process, reliability is had more to the evaluation of the flush efficiency of flushing liquor, the condition and actual conditions of the mud cake of formation are more
It is consistent, simulation degree is high.
In order to solve the above technical problems, general thought is as follows for technical solution in the embodiment of the present application:
A kind of simulation down-hole drilling fluids recycle the device to form mud cake, including autoclave body 3 and fluid circulation matched with autoclave body 3
System simulates down-hole drilling fluids and recycles to form mud cake by the cooperation of autoclave body 3 and fluid circulating system.
3 bottom of autoclave body is provided with rock core grip slipper 4 and autoclave body annular space outlet 15, and rock core grip slipper 4 plays fixation
The effect of rock core, autoclave body annular space outlet 15 facilitate the liquid inside discharge autoclave body 3；3 top side detachable of autoclave body is provided with kettle cover
1, it is convenient to dismount upper kettle cover 1 in time；Rock core 7 is clamped on rock core grip slipper 4,7 bottom of rock core is provided with permeable gasket 10, permeable
Gasket 10 mainly bears rock core 7 and the bulky grain in filtrate can be avoided to enter fluid circulating system and occurred to block up with filter liquor
Plug；There are annular clearances between 3 inner wall of autoclave body and rock core 7, in order to maximize simulation subsurface environment, the annular clearance should as far as possible with reality
Border down-hole annular gap is consistent, can be according to requiring to design.The position of upper 1 face rock core 7 of kettle cover is provided with fluid-infusing port 2,
Fluid is injected by fluid-infusing port 2；4 upper and lower ends of rock core grip slipper have been respectively arranged with the upper plug head 6 of fixed function under
Plug 18, upper plug head 6 are annular plug, are threadedly coupled with rock core grip slipper 4, sealing ring sealing；Upper plug head 6 and lower end cap 18 are solid
Determine 7 lower part of rock core, lower end cap 18 is a round plug, is threadedly coupled with rock core grip slipper 4, sealing ring sealing, on lower end cap 18
It is provided with filtrate (liquid 17, discharge filtrate is facilitated by filtrate (liquid 17；Rock core 7 is placed in the rubber sleeve 5 of rock core grip slipper 4
In, 5 outer surface of rubber sleeve and 4 inner surface annular space position of rock core grip slipper form ring and press chamber 30, the injection pressure into ring pressure chamber 30
Fluid compresses rock core, can fix rock core 7.
The fluid circulating system includes drilling well liquid container 26, filtrate container 25 and ring press pump 12, drilling well liquid container 26
In be equipped with drilling fluid, filtrate container 25 collect filtrate；The inlet of drilling well liquid container 26 connects autoclave body by drilling fluid inlet tube
Annular space outlet 15, to facilitate recycling drilling fluid, the liquid outlet of drilling well liquid container 26 is infused by drilling fluid outlet tube connecting fluid
Entrance 2, so that drilling fluid is injected from fluid-infusing port 2, operating path when this route is circulation of drilling fluid；Filtrate container 25
Inlet by filtrate inlet tube connect filtrate (liquid 17, facilitate collect filtrate；The outlet of ring press pump 12 chamber stream is pressed by ring
Fluid line is connected to ring pressure chamber 30, convenient to increase pressure to ring pressure chamber 30, and rubber sleeve 5 is made to be fixed rock core 7；It is flowed along fluid
Direction is sequentially connected in series on drilling fluid inlet tube and is provided with third control valve 20 and the second back-pressure valve 23, on drilling fluid outlet tube according to
It is secondary to be arranged in series displacement pump 28 and the 5th control valve 29, it is sequentially connected in series on filtrate inlet tube and is provided with the second control valve 19, the
Four back-pressure valves 22 and flowmeter 24, ring, which presses to be sequentially connected in series on chamber fluid line, is provided with the first control valve 13 and pressure gauge 14；It bores
The 4th control valve 21 has also been arranged in parallel on well liquid inlet tube.
First back-pressure valve 22 is the simulated formation pore pressure in order to form back pressure at 17 end of filtrate (liquid, described the
Two back-pressure valves 23 are to form pressure, simulation wellbore hole pressure in autoclave body annular space；First back-pressure valve 22 and the second back-pressure valve 23
Between there are pressure difference (general wellbore pressure be higher than formation pore pressure, i.e. the pressure value of the second back-pressure valve 23 a little higher than first time
The pressure value of pressure valve 22), make there are pressure difference inside and outside rock core 7, under the action of pressure difference leak-off occurs for drilling fluid, in rock core 7
Upper formation mud cake.
The upper kettle cover 1 is threadedly coupled with autoclave body 3, easy disassembly；Fluid-infusing port 2 on upper kettle cover 1 is from top to bottom
In the horn-like structure being gradually increased, avoiding fluid mouthpiece in injection, too small to cause flow velocity excessive tight to 7 surface erosion of rock core
Weight.
The autoclave body 3 is internally provided with temperature sensor 8 and flow sensor 9, to monitor the temperature of fluid in autoclave body 3
Degree and flow velocity achieve the purpose that simulate downhole temperature and drilling well flow velocity.
10 bottom of permeable gasket is provided with false rock core 11, and false rock core 11 can adjust 7 position of rock core.
The autoclave body 3 and fluid circulating system are mounted on inside insulating box 31,31 simulated formation temperature of insulating box.
The displacement pumps 28, temperature sensor 8, flow sensor 9, the first backpressure pump 22, the second backpressure pump 23, flow
Meter 24 and insulating box 31 are electrically connected computer 27, control relevant operation modes by computer 27, and record data.
The rock core grip slipper 4 is set to 3 lower center position of autoclave body.
A method of simulation down-hole drilling fluids recycle to form mud cake, specifically includes the following steps:
(1) rock core prepares: the rock core size that the present invention uses can be diversified, can correspondingly design the mud of different scale
Cheese is at device.It drills in one end of rock core 7 along central axis, drilling does not run through rock core, foot of hole to the another of rock core
The radius that the distance of end face should be rock core 7 subtracts the length of boring radius, that is, guarantees in external drilling fluid seepage flow to core hole
Path length it is consistent.The diameter of drilling is depending on the diameter of rock core, and the 1/5~1/10 of general coring diameter.
(2) rock core is installed: laying down kettle cover 1, rock core 7 is placed among the rubber sleeve 5 of rock core grip slipper, and rock core
Opening direction is downward.The first control valve 13 is opened, ring press pump 12 is opened, constant voltage mode is formed to rubber sleeve 5 and rock core grip slipper 4
Ring pressure chamber 30 in inject fluid, pressure value (takes that the first back-pressure valve, pressure is biggish in the second back-pressure valve than the second back-pressure valve 23
Value, the value of the second back-pressure valve is slightly above the first back-pressure valve in the present invention) pressure value be higher by 2~3MPa, prevent pressure in autoclave body 3
Channelling occurs when pressing chamber 30 higher than ring, while rubber sleeve 5 being made to compress rock core 7, fixed rock core 7 under the action of ring pressure.
(3) mud cake is formed: after installation rock core 7, upper kettle cover 1 being screwed back and is sealed, opens insulating box 31 to requirement of experiment
Temperature, adjust the first back-pressure valve 22, (the second back-pressure valve 23 is the pressure value of the second back-pressure valve 23 to the pressure value of requirement of experiment
Drilling well liquid columnpressure value, the first back-pressure valve 22 are formation pore pressure value, and general drilling well liquid columnpressure is slightly above earth bore
The pressure value of gap pressure, i.e. the second back-pressure valve 23 setting is slightly above 21 pressure value of the first back-pressure valve).Displacement pump 28 is opened, is adjusted
The flow Q of displacement pump, makes flow velocity v of the drilling fluid between autoclave body 3 and rock core in annular space reach the flow velocity of down-hole annular drilling fluid,
The operating pressure and flow of displacement pump are recorded by computer 27:
Known autoclave body internal diameter is D2, the diameter D of rock core1, then it is A=π (D known to annular space area2 2-D1 2)/4, therefore can be substantially
Estimate the drilling well flow velocity v=4Q/ (π (D of annular space2 2-D1 2)), further according to the flow for the flow velocity fine tuning pump that flow sensor is shown
Q makes flow velocity of the annular velocity as far as possible close to setting.
Drilling fluid pumps 28 constant flow rates by displacement from drilling well liquid container 26 and is sucked out, and flows through displacement pump 28 and enters in autoclave body 3,
When the pressure in autoclave body annular space reaches the pressure size of the second back-pressure valve 23, from the outlet 15 of autoclave body annular space through the second back-pressure valve
23 flow back to drilling well liquid container 26, and the first back-pressure valve 22 is smaller than the pressure value of the second back-pressure valve 23, therefore deposit inside and outside rock core 7
In pressure difference, also under differential pressure action leak-off occurs for drilling fluid, on 7 surface of rock core while from 15 outflow of autoclave body annular space outlet
Mud cake is formed, filtrate flow to filtrate container 25 through the first back-pressure valve 22, flowmeter 24 from filtrate (liquid 17.
(4) mud cake rinses: after mud cake is formed, stopping displacement pump 28, the drilling fluid in drilling well liquid container 26 is replaced with
Flushing liquor.Displacement pump 28 is reopened, the flow of adjustment displacement pump 28 makes the flow velocity of flushing liquor simulate the stream of underground flushing liquor
Speed, and make flushing liquor circulation flushing mud cake for a period of time, displacement pump 28 is closed later.
(5) it removal of core: after closing displacement pump 28, opens the 4th control valve 21 and racks up the residual fluid in autoclave body
Entirely；Ring press pump 12 is closed, the pressure fluid in ring pressure chamber 30 for forming rubber sleeve 5 with 4 inner wall of rock core grip slipper exits；It opens
Upper kettle cover 1 takes out the rock core 7 with mud cake.
After the method and step (2) of above-mentioned formation mud cake, i.e., in installation rock core 7 and after screwing back upper kettle cover 1, close autoclave body 3
The second control valve 19 of all outlet ports, third control valve 20, drilling fluid is injected into autoclave body 3 and is pressurizeed saturated core 7, to rock core
After 7 fully saturated drilling fluids, 21 discharging drilling fluid of the 4th control valve is opened, its weight of removal of core is referred to as m1；Again by rock core
It installs, carries out circulation of drilling fluid according to above-mentioned mud cake forming step (3), form mud cake, its weight of removal of core 7 is referred to as m2；
Rock core is installed again, liquid is rinsed according to above-mentioned mud cake rinsing step (4) and rinses, after the completion of flushing, removal of core 7 claims
Its weight is m3；Then flush efficiency can calculate are as follows:
The method mechanism that the present apparatus forms mud cake is identical with underground, at the same the case where rinsed to mud cake with practical flushing
Mud cake it is consistent, therefore to flushing liquor flush efficiency evaluation have high confidence level.
Finally, it should be noted that obviously, the above embodiment is merely an example for clearly illustrating the present invention, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the art, it can also do on the basis of the above description
Other various forms of variations or variation out.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
The obvious changes or variations that Shen goes out are still in the protection scope of this invention.
Claims (10)
1. a kind of simulation down-hole drilling fluids recycle the device to form mud cake, which is characterized in that including,
Autoclave body；Autoclave body bottom is provided with rock core grip slipper and the outlet of autoclave body annular space, and autoclave body top side detachable is provided with kettle cover；Rock
Rock core is clamped on heart grip slipper, rock core bottom is provided with permeable gasket；The position of upper kettle cover face rock core is provided with fluid note
Entrance；Rock core grip slipper upper and lower ends are respectively arranged with upper plug head and lower end cap, are provided with filtrate (liquid on lower end cap；Rock core folder
Core outside surface suit rubber sleeve inside seat is held, rubber sleeve outer surface and rock core clamping base inner surface annular space position form ring pressure
Chamber；
Fluid circulating system；Fluid circulating system includes drilling well liquid container, filtrate container and ring press pump；The feed liquor of drilling well liquid container
Mouth connects the outlet of autoclave body annular space by drilling fluid inlet tube, and the liquid outlet of drilling well liquid container passes through the upper kettle of drilling fluid outlet tube connection
The fluid-infusing port of lid；The inlet of filtrate container connects the filtrate (liquid of lower end cap by filtrate inlet tube；Ring press pump goes out
Mouth presses chamber fluid line to be connected to ring and presses chamber by ring；Along fluid flow direction, it is sequentially connected in series and is provided on drilling fluid inlet tube
Third control valve and the second back-pressure valve are sequentially connected in series on drilling fluid outlet tube and are provided with displacement pump and the 5th control valve, filtrate into
It is sequentially connected in series in liquid pipe and is provided with the second control valve, the 4th back-pressure valve and flowmeter, be sequentially connected in series and set on ring pressure chamber fluid line
It is equipped with the first control valve and pressure gauge；The 4th control valve has also been arranged in parallel on drilling fluid inlet tube.
2. a kind of simulation down-hole drilling fluids as described in claim 1 recycle the device to form mud cake, which is characterized in that described
Upper kettle cover is threadedly coupled with autoclave body, and the fluid-infusing port on upper kettle cover is in the horn-like structure being gradually increased from top to bottom.
3. a kind of simulation down-hole drilling fluids as claimed in claim 2 recycle the device to form mud cake, which is characterized in that described
Autoclave body is internally provided with temperature sensor and flow sensor.
4. a kind of simulation down-hole drilling fluids as claimed in claim 3 recycle the device to form mud cake, which is characterized in that described
Permeable gasket bottom is provided with false rock core.
5. a kind of simulation down-hole drilling fluids as claimed in claim 4 recycle the device to form mud cake, which is characterized in that described
Autoclave body and fluid circulating system are mounted on inside insulating box.
6. a kind of simulation down-hole drilling fluids as claimed in claim 5 recycle the device to form mud cake, which is characterized in that described
Displacement pump, temperature sensor, flow sensor, the first backpressure pump, the second backpressure pump, flowmeter and insulating box are electrically connected calculating
Machine.
7. a kind of simulation down-hole drilling fluids as claimed in claim 6 recycle the device to form mud cake, which is characterized in that described
Rock core grip slipper is set to autoclave body bottom central location.
8. a kind of simulation down-hole drilling fluids recycle the method to form mud cake, which is characterized in that the method the following steps are included:
(1) rock core prepares: choosing rock core, drills in one end of rock core along central axis, drilling does not run through rock core；
(2) install rock core: rock core is placed in the rubber sleeve on rock core grip slipper, the opening direction of rock core downward, to ring pressure
Injection pressure fluid makes rubber sleeve fix rock core in chamber, and ring presses the Fluid pressure of chamber setting higher than the pressure of the second back-pressure valve；
(3) mud cake is formed: adjustment calorstat temperature adjusts the pressure value of the first back-pressure valve and the second back-pressure valve, opens displacement pump,
Drilling fluid is sucked out from drilling well liquid container, is entered in autoclave body through displacement pump, when the pressure in autoclave body reaches the first back-pressure valve
Or second back-pressure valve pressure size when, flowed out from corresponding first back-pressure valve or the second back-pressure valve, due to the first back-pressure valve and
Pressure between second back-pressure valve there are difference,
Leak-off occurs under the action of pressure difference inside and outside rock core for drilling fluid, forms mud cake in core surface；
(4) mud cake rinses: after mud cake is formed, the drilling fluid in drilling well liquid container being replaced with flushing liquor, rinses mud cake；
(5) removal of core: displacement pump is closed, the residual fluid in autoclave body is discharged；Ring press pump pressure is adjusted to zero, mud will be had
The rock core of cake takes out.
9. a kind of simulation down-hole drilling fluids as claimed in claim 8 recycle the method to form mud cake, which is characterized in that step
(1) in, the diameter of drilling is the 1/5~1/10 of core diameter, and the distance of the other end of foot of hole to rock core is equal to rock core
Radius subtracts the distance of boring radius.
10. a kind of simulation down-hole drilling fluids as claimed in claim 9 recycle the method to form mud cake, which is characterized in that step
(3) in, the second back-pressure valve pressure value is greater than the first back-pressure valve pressure value, when the pressure in autoclave body reaches the first back-pressure valve or second
When back-pressure valve pressure, drilling fluid is flowed out from corresponding back-pressure valve.
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| CN201811381935.3A CN109541175B (en) | 2018-11-20 | 2018-11-20 | Device and method for simulating circulation of underground drilling fluid to form mud cakes |
| CN202110071741.9A CN112903961B (en) | 2018-11-20 | 2018-11-20 | Using method of device for simulating underground drilling fluid circulation to form mud cakes |
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| CN201811381935.3A CN109541175B (en) | 2018-11-20 | 2018-11-20 | Device and method for simulating circulation of underground drilling fluid to form mud cakes |
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| CN201811381935.3A Active CN109541175B (en) | 2018-11-20 | 2018-11-20 | Device and method for simulating circulation of underground drilling fluid to form mud cakes |
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| CN111175208A (en) * | 2019-12-24 | 2020-05-19 | 中国地质大学（北京） | Drilling fluid mud cake permeability evaluation device and method |
| CN111693455A (en) * | 2020-05-14 | 2020-09-22 | 中国石油大学(北京) | Drilling fluid mud cake generation test method |
| CN111781328A (en) * | 2020-05-14 | 2020-10-16 | 中国海洋石油集团有限公司 | Drilling fluid mud cake generation test shaft simulation mechanism and system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109541175B (en) | 2021-03-12 |
| CN112903961A (en) | 2021-06-04 |
| CN112903961B (en) | 2022-02-01 |
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